Clyde Tombaugh Signed Autographed Palomar First Day Cover 1948 COOL! LOOK!

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Clyde W. Tombaugh (1906-1997) American astronomer who discovered Pluto in 1930. Tombaugh also discovered countless asteroids and was active in researching UFO's. He has added an extra "note" on the signed cover that "I was there under the 200." Meaning, he was in attendance at the dedication in 1948 of Palomar Mountain Observatory. The cover is signed by Tombaugh and reads: "Clyde W. Tombaugh Discovered 9th planet Pluto, on 18 February 1930." This item is guaranteed to be 100% authentic and would pass any third- party verification and comes with my personal COA. If you are not pleased with this item for any reason, it may be returned. I have been collecting historic items and autographs for over 50 years and am in the process of liquidating much of my personal collection and inventory. KEEP CHECKING BACK FOR MORE LISTINGS OF UNIQUE ITEMS AND AUTOGRAPHS. THANK YOU!